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During the colonisation of this tray, the perimeter was exposed to more air exchange and a different growth formed. It's not rhizomorhic, rather it's fluffy like a marshmellow. I've never encountered this with this much abundance... I was wondering if it should be removed before cold shocking. Can pinning even occur on this type of growth?

Umm. First of all, if that's supposed to be cubensis mycelium, it's the nastiest looking mycelium I've ever seen. It looks more like a severe, matted cobweb infestation. Why is it GREY!!! And what are those yellowish/tan spots all over it?!

It really does look bad, man...

The white around the outsides looks to me like the early stages of Trichoderma (green mold.) Especially in the upper part, slightly to the left.. If it is, then within 24 hours it will begin to turn a forest green color (as it begins to produce spores, which will infect anything else you are working on).

It looks to me like you have a shitstorm of different contaminants there, and you should probably throw that ugly thing out ASAP..

Which suggests you've encountered it before.. In fact, which suggests you've grown before.. So why didn't you notice that your mycelium was grey?! The only thing that I know of that's white and has the consistency of a marshmellow is the damn Trich harzanium, which will destroy your casing. Throw it out. NOW!

Looks tasty. Feed it to your dog, or someone you dont like,. If they trip, well then you know, if they die, well then you know. But really, i would throw it away, that cant be good. But if you know its not a contamination then i would remove it before doing anything else to it.

That is cobweb in the center and mycelium around the edges. Thanks to the greater air exchange the mycelium was able to colonize the edges but wasn't able to colonize the center before the cobweb set in. Now the cobweb is fighting and will eventually kill the mycelium on the edges. Throw this out.

>And what are those yellowish/tan spots all over it?! It's mycelium piss, it's trapped inside the network. Have you ever birthed a cake and noticed that water was trapped in the network like a blister? Thats the same thing.

>The white around the outsides looks to me like the early stages of Trichoderma (green mold.) ... If it is, then within 24 hours it will begin to turn a forest green color.This particular tray has remained like this for several days, if it were green mold than I can't explain why it wouldn't have turned green yet.

>Why is it GREY!!!Perhaps it's just the camera. The substrate is horsepoo, and has always been an off-white IME. (usually light brown)

The perimeter appears to be mycellium,the same kind that you get at the base of mushrooms. I can't explain it, I was assuming that it was just a reaction due to gas exchange. I know the picture looks very bad, but I don't think it's a contamination. Reguardless, it's being isolated for observation.